Thanks about the GOTD! :)
When wanting to install the program, it wanted to install it:
C:!PDFcombine
Could your firm be so kind and let the installer ad least want to install at one Program Files, so it's installed correctly at the x32 or x64 Program Files direction.
So, what is the program, is it a x32 or a x64 program?
Might be a good think to know about the Portable version too. Might be it won't function on a system, because..
PS: Have a happy work week & weekend! :)